Sildenafil is one of the most popular and proven treatments for Erectile dysfunction. This drug works by increasing the blood flow to the penis; it requires sexual arousal to work. only when aroused the combination of relaxation and increased blood flow helps fill the penis with blood, therefore helping you achieve an erection when you need one.
Popular ED treatment
Works within                                                             1 hour
Lasts up to                                                                4 hours
If you are approved after the prescriber has reviewed your consultation, you will be offered the treatment; The Prescriber may offer you an alternative that will suit you better. This will be for you and the prescriber to jointly consider. However, the final decision to prescribe will always be the prescriber’s.

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  1. Sildenafil is part of the PDE5 medicines that function by relaxing the muscles in blood vessel walls, increasing the blood flow to the penis in order to get or maintain an erection when sexual stimulation occurs.
  2. Sildenafil, among a variety of other similar or related PDE5 inhibitors, has become a common and effective treatment for erectile. Millions of people use sildenafil internationally. Although the medication has historically been most popularly recognized as Pfizer’s brand name Viagra, sildenafil is currently available generically, which has the same effect and is cheaper as you are not paying for the Brand Name.

Erectile Dysfunction treatments: what to expect

Straightforward answers to frequently asked questions.

The results will not be instantaneous. It can take approximately One Hour to achieve an Erection and the effects can last up to 4 hours. 

You will need to be sexually aroused for Sildenafil to take its effect.

The Effects of the medicine may be delayed after having food, especially large amounts. 

It is important to plan for when you need the effect.

The recommended starting dose for sildenafil is 50mg to be used on the days you plan to have sex. Higher doses may be required depending on your initial response however this can be discussed with your prescribing pharmacist if required.

If planning is very difficult; another drug called tadalafil (used for erectile dysfunction) may be a better fit for you. Its mode of action is similar to that of sildenafil however it takes effect quicker and can last upto 36 hours. Therefore, you can be more spontaneous with your sexual activity when aroused.

The reason is because it is a “generic” medicine . This means that it does not have a Brand Name rather it uses the same ingredient (sildenafil) to give the same effect. 

In terms of dosage, safety, strength, quality, how well it performs, how it’s administered in the body, and what it’s used for; it is exactly the same.

Many Men will not experience any unwanted side effects by using sildenafil; however there are some you should be aware of;

  Headaches.

  Dizziness, feeling faint.

  Nasal congestion/stuffiness.

  Feeling hot or flushed, including facial flushing.

  Nausea.

  Indigestion.

  Visual changes (including colour changes, sensitivity to light and blurred vision).

you should always read before taking your treatment for the first time the Patient Information Leaflet enclosed with your medication, this contains a complete list of possible side effects both common, uncommon and serious.

You should immediately contact the emergency services if you experience any severe side effects.

Drinking alcohol can generally make you less able to achieve an erection. It can also worsen or exacerbate some of the possible side effects of sildenafil. Eg dizziness, feeling faint and headaches

Other treatments are available for erectile dysfunction:

If your erectile dysfunction is situational, for example, you still have an early morning erection, then psychosexual therapy may be helpful. You can access registered therapists on  


For further information on treatments for erectile dysfunction, including complementary treatments such as kegel exercises (which strengthen the muscles in the pelvic floor and can be helpful for patients with ED) please see the NHS website:   

Patient information leaflet

Please click HERE for Viagra and HERE for Sildenafil to download the patient information leaflets. (

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